The equation of the common tangent of th...

The equation of the common tangent of the two touching circ les `y^2+x^2 -6x-12y+37=0` and `x^2+y^2-6y+7=0` is

A

`x-y- 5= 0`

B

`x-y+5= 0`

C

`x+y-5= 0`

D

`x+y+5= 0`

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The correct Answer is:

C

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